how long do they last
40395
I used them right away , i saw only a 1 shade difference and had issues with them causing my teeth to get sensitive to cold
2266278
Im not exactly sure but its not that long. I bought them for my kids and if i had to guess I'd say mabe 4-5 hours.
2087832
most last about 10hrs...however there are some that I've bought that were still hot the next morning..(activate at 8am and still warm next day same time)I only need them to last an 8 hr shift at work...I have arthritis in my hands & wrists and these help with the pain of keying on a computer all day...I use them in fingerless "gloves" as far as shelf life I buy a large box & use them 5 days a week..so I dont keep them for months...they do not activate until opened ...
1439395
Mine have lasted for over 2 years and still work. After they get older than that they do not last as long and get hard in the package. I always have some left year to year because I cannot always find them when I need them.
417654
don't know. When I buy them they are usually good for 6 to 12 months or longer.
614650
i only had mine for about 6 months, i guess the work till the lights go out. they seem sturdy so i figure a couple of years. i swear by this product. a neighbor still has bugs and i havent seen any in months. well worth buying.
351616
Not enough time put into using them to tell just yet, but they have lasted just fine for the amount of time I have used them. Which for reference is maybe 40 or so hours since I got them a few months ago.TL;DR They seem pretty reliable so far.
723171
They are designed to last approximately 30-45 days. However, I have seen customers that have gotten much more time out of them. An average usage time would be about 2 months.
2081008
I have had mine for over a year and they still look perfect t. Of course, you can't ever cut into them with a knife or burn and reburn them again and again like some people do. If you take care of them ,they should last for many years. Get them and enjoy.
400907
I have never read anywhere how long they last. I am sure if you take care of them they will last a long time.
1292882
I've only had mine for about 2 months, so I can't speak for how long they last. Fortunately, no issues thus far with them.
752058
I'd say they last a good 18 months or so. Recommend this product, but cover or remove in winter; it will crack with repeated hard freezes.
128477
I bought a pair of these in late September. After about 150 miles of running something within them has given way and makes a noticeable rattling on the control (right ear) side.. They still work though, but just bear in mind that they are a consumable that will not last for years on end. Given that they are rechargeable, I figured I'd get about 18-24 solid months out of them, but sadly that may not be the case. I'll use them till they fail or if the rattling becomes overly obnoxious. I've used them in warm temps, freezing temps, light rain and snow and they work just fine. They aren't water/weatherproof, but given the physical breakdown I'll have no qualms against using them out in the elements. I bought a pair of these in late September. After about 150 miles of running something within them has given way and makes a noticeable rattling on the control (right ear) side.. They still work though, but just bear in mind that they are a consumable that will not last for years on end. Given that they are rechargeable, I figured I'd get about 18-24 solid months out of them, but sadly that may not be the case. I'll use them till they fail or if the rattling becomes overly obnoxious. I've used them in warm temps, freezing temps, light rain and snow and they work just fine. They aren't... » Read More I bought a pair of these in late September. After about 150 miles of running something within them has given way and makes a noticeable rattling on the control (right ear) side.. They still work though, but just bear in mind that they are a consumable that will not last for years on end. Given that they are rechargeable, I figured I'd get about 18-24 solid months out of them, but sadly that may not be the case. I'll use them till they fail or if the rattling becomes overly obnoxious. I've used them in warm temps, freezing temps, light rain and snow and they work just fine. They aren't water/weatherproof, but given the physical breakdown I'll have no qualms against using them out in the elements. « Show Less
1845927
they do not last as long as i would like them to last. I am using them a lot quicker then ever before.
1251934
Some have lasted me a full 2 days. but some not even a day. So its a flip of a coin..
1283144
I only use mine for 1 to 2 hours a day. I've had them for 7 months and have not had a problem with them.
1181300
I've had mine since May 2014 and they are still burning every evening. They are beginning to be less bright and I will change batteries soon. I can say mine have lasted six months until a battery change. Happy!